drivers/infiniband/core/rdma_core.h

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005-2017 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #ifndef RDMA_CORE_H
  38 #define RDMA_CORE_H
  39
  40 #include <linux/idr.h>
  41 #include <rdma/uverbs_types.h>
  42 #include <rdma/uverbs_ioctl.h>
  43 #include <rdma/ib_verbs.h>
  44 #include <linux/mutex.h>
  45
  46 struct ib_uverbs_device;
  47
  48 void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile,
  49                              enum rdma_remove_reason reason);
  50
  51 int uobj_destroy(struct ib_uobject *uobj);
  52
  53 /*
  54  * uverbs_uobject_get is called in order to increase the reference count on
  55  * an uobject. This is useful when a handler wants to keep the uobject's memory
  56  * alive, regardless if this uobject is still alive in the context's objects
  57  * repository. Objects are put via uverbs_uobject_put.
  58  */
  59 void uverbs_uobject_get(struct ib_uobject *uobject);
  60
  61 /*
  62  * In order to indicate we no longer needs this uobject, uverbs_uobject_put
  63  * is called. When the reference count is decreased, the uobject is freed.
  64  * For example, this is used when attaching a completion channel to a CQ.
  65  */
  66 void uverbs_uobject_put(struct ib_uobject *uobject);
  67
  68 /* Indicate this fd is no longer used by this consumer, but its memory isn't
  69  * necessarily released yet. When the last reference is put, we release the
  70  * memory. After this call is executed, calling uverbs_uobject_get isn't
  71  * allowed.
  72  * This must be called from the release file_operations of the file!
  73  */
  74 void uverbs_close_fd(struct file *f);
  75
  76 /*
  77  * Get an ib_uobject that corresponds to the given id from ufile, assuming
  78  * the object is from the given type. Lock it to the required access when
  79  * applicable.
  80  * This function could create (access == NEW), destroy (access == DESTROY)
  81  * or unlock (access == READ || access == WRITE) objects if required.
  82  * The action will be finalized only when uverbs_finalize_object or
  83  * uverbs_finalize_objects are called.
  84  */
  85 struct ib_uobject *
  86 uverbs_get_uobject_from_file(u16 object_id,
  87                              struct ib_uverbs_file *ufile,
  88                              enum uverbs_obj_access access, s64 id);
  89
  90 /*
  91  * Note that certain finalize stages could return a status:
  92  *   (a) alloc_commit could return a failure if the object is committed at the
  93  *       same time when the context is destroyed.
  94  *   (b) remove_commit could fail if the object wasn't destroyed successfully.
  95  * Since multiple objects could be finalized in one transaction, it is very NOT
  96  * recommended to have several finalize actions which have side effects.
  97  * For example, it's NOT recommended to have a certain action which has both
  98  * a commit action and a destroy action or two destroy objects in the same
  99  * action. The rule of thumb is to have one destroy or commit action with
 100  * multiple lookups.
 101  * The first non zero return value of finalize_object is returned from this
 102  * function. For example, this could happen when we couldn't destroy an
 103  * object.
 104  */
 105 int uverbs_finalize_object(struct ib_uobject *uobj,
 106                            enum uverbs_obj_access access,
 107                            bool commit);
 108
 109 void setup_ufile_idr_uobject(struct ib_uverbs_file *ufile);
 110 void release_ufile_idr_uobject(struct ib_uverbs_file *ufile);
 111
 112 /*
 113  * This is the runtime description of the uverbs API, used by the syscall
 114  * machinery to validate and dispatch calls.
 115  */
 116
 117 /*
 118  * Depending on ID the slot pointer in the radix tree points at one of these
 119  * structs.
 120  */
 121
 122 struct uverbs_api_ioctl_method {
 123         int(__rcu *handler)(struct uverbs_attr_bundle *attrs);
 124         DECLARE_BITMAP(attr_mandatory, UVERBS_API_ATTR_BKEY_LEN);
 125         u16 bundle_size;
 126         u8 use_stack:1;
 127         u8 driver_method:1;
 128         u8 disabled:1;
 129         u8 has_udata:1;
 130         u8 key_bitmap_len;
 131         u8 destroy_bkey;
 132 };
 133
 134 struct uverbs_api_write_method {
 135         int (*handler)(struct uverbs_attr_bundle *attrs);
 136         u8 disabled:1;
 137         u8 is_ex:1;
 138         u8 has_udata:1;
 139         u8 has_resp:1;
 140         u8 req_size;
 141         u8 resp_size;
 142 };
 143
 144 struct uverbs_api_attr {
 145         struct uverbs_attr_spec spec;
 146 };
 147
 148 struct uverbs_api {
 149         /* radix tree contains struct uverbs_api_* pointers */
 150         struct radix_tree_root radix;
 151         enum rdma_driver_id driver_id;
 152
 153         unsigned int num_write;
 154         unsigned int num_write_ex;
 155         struct uverbs_api_write_method notsupp_method;
 156         const struct uverbs_api_write_method **write_methods;
 157         const struct uverbs_api_write_method **write_ex_methods;
 158 };
 159
 160 /*
 161  * Get an uverbs_api_object that corresponds to the given object_id.
 162  * Note:
 163  * -ENOMSG means that any object is allowed to match during lookup.
 164  */
 165 static inline const struct uverbs_api_object *
 166 uapi_get_object(struct uverbs_api *uapi, u16 object_id)
 167 {
 168         const struct uverbs_api_object *res;
 169
 170         if (object_id == UVERBS_IDR_ANY_OBJECT)
 171                 return ERR_PTR(-ENOMSG);
 172
 173         res = radix_tree_lookup(&uapi->radix, uapi_key_obj(object_id));
 174         if (!res)
 175                 return ERR_PTR(-ENOENT);
 176
 177         return res;
 178 }
 179
 180 char *uapi_key_format(char *S, unsigned int key);
 181 struct uverbs_api *uverbs_alloc_api(struct ib_device *ibdev);
 182 void uverbs_disassociate_api_pre(struct ib_uverbs_device *uverbs_dev);
 183 void uverbs_disassociate_api(struct uverbs_api *uapi);
 184 void uverbs_destroy_api(struct uverbs_api *uapi);
 185 void uapi_compute_bundle_size(struct uverbs_api_ioctl_method *method_elm,
 186                               unsigned int num_attrs);
 187 void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile);
 188
 189 extern const struct uapi_definition uverbs_def_obj_counters[];
 190 extern const struct uapi_definition uverbs_def_obj_cq[];
 191 extern const struct uapi_definition uverbs_def_obj_device[];
 192 extern const struct uapi_definition uverbs_def_obj_dm[];
 193 extern const struct uapi_definition uverbs_def_obj_flow_action[];
 194 extern const struct uapi_definition uverbs_def_obj_intf[];
 195 extern const struct uapi_definition uverbs_def_obj_mr[];
 196 extern const struct uapi_definition uverbs_def_write_intf[];
 197
 198 static inline const struct uverbs_api_write_method *
 199 uapi_get_method(const struct uverbs_api *uapi, u32 command)
 200 {
 201         u32 cmd_idx = command & IB_USER_VERBS_CMD_COMMAND_MASK;
 202
 203         if (command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED |
 204                              IB_USER_VERBS_CMD_COMMAND_MASK))
 205                 return ERR_PTR(-EINVAL);
 206
 207         if (command & IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 208                 if (cmd_idx >= uapi->num_write_ex)
 209                         return ERR_PTR(-EOPNOTSUPP);
 210                 return uapi->write_ex_methods[cmd_idx];
 211         }
 212
 213         if (cmd_idx >= uapi->num_write)
 214                 return ERR_PTR(-EOPNOTSUPP);
 215         return uapi->write_methods[cmd_idx];
 216 }
 217
 218 void uverbs_fill_udata(struct uverbs_attr_bundle *bundle,
 219                        struct ib_udata *udata, unsigned int attr_in,
 220                        unsigned int attr_out);
 221
 222 #endif /* RDMA_CORE_H */